import type { CatalogDelta, CatalogRevisionWindow, PackIndexEntry } from '@forgeax/engine-types';
/**
 * Derives one neutral delta from consecutive complete catalog projections.
 *
 * The returned fields are canonical POD fields: topology, revision continuity,
 * authority, and diagnostics remain structured so AI consumers do not parse
 * producer or transport messages. Degraded results intentionally contain no
 * added, changed, or removed identity rows.
 */
export declare function calculateCatalogDelta(previous: readonly PackIndexEntry[], next: readonly PackIndexEntry[], revision?: CatalogRevisionWindow): CatalogDelta | undefined;
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